An internal air chamber for excellent support and a down topper for unparalleled warmth and soft cushioning. The tricot surface is comfortable against the skin and washable. If you lay your head on a pillow at home make sure to do the same in the backcountry! Adjustable height for side , back and belly sleepers. Anatomical shape holds head in place. Sturdy, low profile FlatValve for inflation and deflation. Inner air pillow is removable when pillow case requires washing. Two grommets for securing to sleeping mat. Stuffs into it's own flap.